The term is only used of video games, which are today almost all real-time, the shift having proceeded gradually through the 1980s and 1990s, partly enabled by increases in computing power.
The relatively new video game genre known as real-time strategy modified traditional strategy games in a way that brought public attention to the differences between real-time and turn-based games.
Examples of some real-time strategy games are Command and Conquer, Red Alert, StarCraft, and Age of Empires.
Compare turn-based game.